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Open-File Report No. Neigc16c:B6

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Open-File Report No. Neigc16c:B6 DEPARTMENT OF AGRICULTURE, CONSERVATION AND FORESTRY Maine Geological Survey Robert G. Marvinney, State Geologist OPEN-FILE REPORT NO. NEIGC16C:B6 Title: Hydrogeology and Coastal Processes at Popham Beach State Park Authors: Ryan P. Gordon and Stephen M. Dickson Date: October 2016 Reprinted in color, by permission, from: Berry, Henry N., IV, and West, David P., Jr., editors, 2016, Guidebook for field trips along the Maine coast from Maquoit Bay to Muscongus Bay: New England Intercollegiate Geological Conference, 108th Annual Meeting, October 14-16, 2016, Bath, Maine, 326 p. Contents: 30 p. report Recommended Citation: Gordon, Ryan P., and Dickson, Stephen M., 2016, Hydrogeology and coastal processes at Popham Beach State Park: in Berry, Henry N., IV, and West, David P., Jr., editors, Guidebook for field trips along the Maine coast from Maquoit Bay to Muscongus Bay: New England Intercollegiate Geological Conference, p. 201-230. NEW ENGLAND INTERCOLLEGIATE GEOLOGICAL CONFERENCE 108th Annual Meeting Guidebook for Field Trips along the Maine Coast from Maquoit Bay to Muscongus Bay Edited by Henry N. Berry IV and David P. West, Jr. Hosted by The Maine Geological Survey and The Middlebury College Geology Department October 14-16, 2016 Copies of this guidebook, as long as they last, may be purchased for $25 from the following address: Geology Department Middlebury College 276 Bicentennial Way Middlebury, VT 05753 Cover Credit The cover photograph is by Arthur M. Hussey II, to whom this guidebook is dedicated. Arthur Hussey was an accomplished photographer and his numerous photo collections highlighted many aspects of the natural beauty of southwestern Maine. The photo was taken by Arthur at a location about a kilometer south of Lookout Point along the western shore of Harpswell Neck. Arthur first began mapping in this area in 1962, and his 1965 NEIGC field trip visited exposures nearby. The view in the photo is towards the south and the exposures are east-dipping metamorphosed Ordovician volcanic rocks of the Cushing Formation. Arthur's hammer for scale. The field guides for this Conference are offered under the terms of the Creative Commons Attribution-Non-Commercial 3.0 Unported DISCLAIMER Before visiting any of the sites described in New England Intercollegiate Geological Conference guidebooks, you must obtain permission from the current landowners. Landowners only granted permission to visit these sites to the organizers of the original trips for the designated dates of the conference. It is your responsibility to obtain permission for your visit. Be aware that this permission may not be granted. Especially when using older NEIGC guidebooks, note that locations may have changed drastically. Likewise, geological interpretations may differ from current understandings. Please respect any trip stops designated as "no hammers", "no collecting" or the like. Consider possible hazards and use appropriate caution and safety equipment. NEIGC and the hosts of these online guidebooks are not responsible for the use or misuse of the guidebooks. Printed by Reprographics, Middlebury College, Middlebury, VT 05753 This document is printed on recycled paper ii B6-1 HYDROGEOLOGY AND COASTAL PROCESSES AT POPHAM BEACH STATE PARK By Ryan P. Gordon and Stephen M. Dickson, Maine Geological Survey, 93 State House Station, Augusta, ME 04333 [email protected]; [email protected] INTRODUCTION Over the last 15 years, shoreline change and tidal inlet migration at Popham Beach State Park have destroyed and created dunes, undercut a mature pitch pine back dune forest, and threatened park infrastructure. During the 2009-2010 East Coast sea level rise anomaly, a trifecta of king tides, storm surge, and high surf led to the formation of a new barrier island in March 2010 (Figure 1). Felled pines and beach scraping in 2011 were used to reduce tidal channel meandering and protect newly constructed bathhouses. This coastal system appears more dynamic than ever and may signal acceleration in coastal processes that may accompany higher sea level. Popham Beach is also Maine’s most visited state park, hosting over 175,000 visitors each year (Figure 2). Over 2 million gallons of fresh water per year are drawn from a shallow well in the sandy back-dune aquifer. A network of observation wells are currently being monitored by MGS to help model the extraction and replenishment of groundwater, and to watch for indications of salt-water intrusion into the fresh aquifer. Geophysics and computer modeling have been used to estimate the risk of salt-water intrusion as seal level rises and shorelines change. On this trip we will see a wide variety of dynamic geomorphic features, watch coastal processes in action, measure monitoring wells, review field data that constrains a model, discuss erosion, sea-level rise, storm surge, and salt-water intrusion. If you have visited this beach before, chances are it looks different today and will look different on your next visit. Change happens here on time scales of months and years, as well as millennia. COASTAL GEOLOGIC OVERVIEW Barrier island genesis occurs on both transgressive and regressive coasts. Most barrier islands tend to form, migrate, and in some cases, disappear with submergence on the continental shelf. In a simple transgressive model, rising sea level allows barrier dunes to be flooded in storms with washover deposits behind the primary frontal dune and even into a back-barrier salt marsh or lagoon. Overwash is a process that conserves beach and dune sand and the landform migrates inland under a rising sea level. In sand-starved settings the sediment budget is lean and, without sufficient introduction of sand, barrier islands can also submerge and become inner shelf shoals. In a simple regressive model, with or without relative sea level rise, ample sediment in the littoral system can result in progradation of beaches and dunes that advance seaward with preserved former frontal dune ridges and storm lag deposits beneath the beachface. Stratigraphy of coastal barrier systems in this region was presented in the 2000 NEIGC field trip guide (Buynevich and FitzGerald, 2000a). Stratigraphy is important in understanding the severity and cycles of beach erosion. Hunnewell Beach has a punctuated style of barrier progradation interrupted with episodes of severe erosion (Buynevich and FitzGerald, 2000b). The barrier lithesome is composed of a medium fine sand on the order of 20 feet thick overlying a coarse sand of an earlier transgressive barrier that formed some 4,000 years ago (Buynevich et al., 2004). 201 B6-2 GORDON AND DICKSON Winter storm erosion on East Beach results in annual heavy mineral concentrations on the beachface with a concentration of garnet, magnetite, and other felsic minerals. Ground penetrating radar detected at least 4 heavy mineral concentrations in the Hunnewell Beach barrier lithesome that, based on optical luminescence dating, suggest four episodes of extreme beach erosion around 150, 290, 390, and 1,550 years ago (Buynevich et al., 2007). The most recent severe event, with a 1% chance of occurrence (or “100-year storm), was the Blizzard of February 1978 that left an erosional scarp at Popham and Hunnewell Beaches. In the last decade, erosion by the Morse River removed most vestiges of the 1978 dune scarp in the park and East Beach lost the dunes that survived that storm of record. Popham Beach sand is predominantly fine sand (2-3 phi units) with medium sand (1-2 phi) offshore of East Beach (Buynevich and FitzGerald, 2003; FitzGerald et al., 2000). The lower shoreface off East Beach encounters an outer bar between the Fox Islands and Pond Island Shoal that represents the modern Kennebec River delta and a source of sand for Popham Beach (Fenster and FitzGerald, 1996; FitzGerald et al., 2000). Farther seaward of Popham Beach, the seabed contours are relatively smooth between Small Point and Seguin Island with a few low- relief bedrock outcrops. An area southwest of Jackknife Ledge has been used for disposal of medium to coarse sand from the lower Kennebec River channel dredged by the U. S. Army Corps of Engineers. Beyond the active shoreface, is the Kennebec Paleodelta with an estimated late Pleistocene through Holocene sediment accumulation of on the order of 400 million cubic yards of sediment infilling and burying the bedrock relief (Barnhardt et al., 1997; Belknap et al., 2002; Kelley et al, 2003). Figure 1. Aerial photograph of Popham Beach geomorphology showing two Morse River channels. Photo by John Picher, Department of Conservation, March 10, 2010. 202 GORDON AND DICKSON B6-3 Figure 2. Nautical chart and topographic map of the mouth of the Kennebec River and the Popham Beach area (from Dickson, 2009). Spirit Pond is west of the label and Silver lake is shown by the arrow. Spirit Pond is tidal and discharges thorough the Morse River. Rarely are beach systems drift neutral with no longshore drift. Coastal circulation occurs at many temporal scales from large-scale continental shelf circulation down to brief periods of storm-driven downwelling or upwelling mixed with wave-induced currents (Dickson, 1999). In addition, coastal circulation and sediment transport are locally affected by tidal inlets and river discharge (FitzGerald et al., 2002). Tidal inlet currents provide a nearly constant reworking of sand into flood- and ebb-tidal deltas, and channel margin bars, as well as inducing scour in estuarine channels and along barrier islands. In general on passive continental margins such as in New England coast, barrier island evolution is a dynamic process that occurs over millennia punctuated by extreme storm events with often lasting geomorphic change, such as inlet formation that segments a coastal barrier and forms a new barrier island (FitzGerald et al., 2002; Buynevich et al., 2004; 2007). 203 B6-4 GORDON AND DICKSON Popham Beach experiences the forces that make portions of the beach and dune system transgressive and other portions regressive.
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